fix: frozen install with dir deps that have no manifest (#3793)

.changeset/six-mice-perform.md

@@ -0,0 +1,5 @@
+---
+"@pnpm/headless": patch
+---
+
+Frozen install should not fail if the lockfile contains references to directories with no `package.json` file.

packages/headless/src/index.ts

@@ -488,8 +488,13 @@ async function linkRootPackages (
             if (importerManifestsByImporterId[importerId]) {
               return importerManifestsByImporterId[importerId]
             }
-            // TODO: cover this case with a test
-            return await readProjectManifestOnly(packageDir) as DependencyManifest
+            try {
+              // TODO: cover this case with a test
+              return await readProjectManifestOnly(packageDir) as DependencyManifest
+            } catch (err) {
+              if (err['code'] !== 'ERR_PNPM_NO_IMPORTER_MANIFEST_FOUND') throw err
+              return { name: alias, version: '0.0.0' }
+            }
           })() as DependencyManifest
           await symlinkDirectRootDependency(packageDir, opts.importerModulesDir, alias, {
             fromDependenciesField: isDev && 'devDependencies' ||

packages/supi/test/install/local.ts

@@ -57,6 +57,11 @@ test('local directory with no package.json', async () => {
   const expectedSpecs = { pkg: 'link:pkg' }
   expect(manifest.dependencies).toStrictEqual(expectedSpecs)
   await project.has('pkg')
+
+  await rimraf('node_modules')
+
+  await install(manifest, await testDefaults({ frozenLockfile: true }))
+  await project.has('pkg')
 })
 
 test('local file via link:', async () => {